Nortel Modular ICS 6.0 Installer's Manual page 588

588 / Problems for network or remote users
Possible problem
There may be a malfunction in the line that the remote caller
accessed.
Solution
If the problem is persistent, check that all lines in the affected
line pool are functioning normally.
Possible problem
There may be a malfunction in the system that the caller is
trying to reach.
Solution
Inform the operators of the system at the far end that the dialed
number is not getting through.
Modular ICS 6.0 Installer Guide P0992638 03